'\" t
.\"     Title: ping_pong
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 03/09/2023
.\"    Manual: CTDB - clustered TDB database
.\"    Source: ctdb
.\"  Language: English
.\"
.TH "PING_PONG" "1" "03/09/2023" "ctdb" "CTDB \- clustered TDB database"
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.SH "NAME"
ping_pong \- measures the ping\-pong byte range lock latency
.SH "SYNOPSIS"
.HP \w'\fBping_pong\fR\ 'u
\fBping_pong\fR {\-r | \-w | \-rw} [\-m] [\-c] {\fIFILENAME\fR} {\fINUM\-LOCKS\fR}
.SH "DESCRIPTION"
.PP
ping_pong measures the byte range lock latency\&. It is especially useful on a cluster of nodes sharing a common lock manager as it will give some indication of the lock manager\*(Aqs performance under stress\&.
.PP
FILENAME is a file on shared storage to use for byte range locking tests\&.
.PP
NUM\-LOCKS is the number of byte range locks, so needs to be (strictly) greater than the number of nodes in the cluster\&.
.SH "OPTIONS"
.PP
\-r
.RS 4
test read performance
.RE
.PP
\-w
.RS 4
test write performance
.RE
.PP
\-m
.RS 4
use mmap
.RE
.PP
\-c
.RS 4
validate the locks
.RE
.SH "EXAMPLES"
.PP
Testing lock coherence
.sp
.if n \{\
.RS 4
.\}
.nf
      ping_pong test\&.dat N
    
.fi
.if n \{\
.RE
.\}
.PP
Testing lock coherence with lock validation
.sp
.if n \{\
.RS 4
.\}
.nf
      ping_pong \-c test\&.dat N
    
.fi
.if n \{\
.RE
.\}
.PP
Testing IO coherence
.sp
.if n \{\
.RS 4
.\}
.nf
      ping_pong \-rw test\&.dat N
    
.fi
.if n \{\
.RE
.\}
.SH "SEE ALSO"
.PP
\fBctdb\fR(7),
\m[blue]\fB\%https://wiki.samba.org/index.php/Ping_pong\fR\m[]
.SH "AUTHOR"
.br
.PP
This documentation was written by Mathieu Parent
.SH "COPYRIGHT"
.br
Copyright \(co 2002 Andrew Tridgell
.br
.PP
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version\&.
.PP
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE\&. See the GNU General Public License for more details\&.
.PP
You should have received a copy of the GNU General Public License along with this program; if not, see
\m[blue]\fB\%http://www.gnu.org/licenses\fR\m[]\&.
.sp
